Add docs for target_arch (#7922)

* Update index.md

* Move example to 1.6 and add TARGET_ARCH docs

* Fixed reference to 1.4.3

* Simplify tip for architecture/version
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Brian Avery 2020-08-13 09:08:35 -04:00 committed by GitHub
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@ -42,9 +42,10 @@ Follow these steps to get started with Istio:
{{< tip >}}
The command above downloads the latest release (numerically) of Istio.
To download a specific version, you can add a variable on the command line.
For example to download Istio 1.4.3, you would run
`curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.4.3 sh -`
You can pass variables on the command line to download a specific version
or to override the processor architecture.
For example, to download Istio 1.6.8 for the x86_64 architecture,
run `curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.6.8 TARGET_ARCH=x86_64 sh -`.
{{< /tip >}}
1. Move to the Istio package directory. For example, if the package is